Powerball is the finely engineered, high-precision gyroscope designed to help you build strength, rehab injuries, and stay healthy. All you have to do is wind back the zinc rotor, release, and turn your wrist in slow, gentle circles. Inside the sphere, speed builds rapidly to produce a powerful resistance that is just as effective for non-impact rehabilitation as it is for isometric strengthening of the arm from fingertip to shoulder. Whether you're an active athlete or spend too much time sitting at work, Powerball can help you get your body on track and energized.